Ultrasonic Testing of Annealing Behavior and Texture and Determination of Texture Coefficients in Stainless Steel

摘要

Ultrasonic velocity measurements have been used to characterize the microstructural evolution during annealing of cold worked titanium mod-ified 316 stainless steel. Velocity measurements with an accuracy of more than ±0.1% were made using longitudinal and shear wave probes. Varia-tion in velocity with annealing temperature and time were correlated with variations in microstructures and mechanical properties. One to one corre-spondence was observed between the velocity measurement and mechani-cal property measurement in characterizing the annealing behavior. The velocity ratio parameter (ratio between longitudinal and shear wave veloc-ities) was found to predict the onset, progress and completion of recrystallization more exactly. Using the velocity measurements made in the direc-tions parallel and perpendicular to the cold work direction, the fourth order expansion coefficients of the orientation distribution function, which repre-sents the texture in this alloy, were determined.